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Monitors - General Information | Tech Info Home Page |


General Information - 

If you are looking for Monitors, prices, drivers or technical support links go to "The CRT Monitor Hardware" page.

Refresh Rates -

Refresh rates measure how fast the screen is repainted. The horizontal scan rate is measured in kilohertz (kHz) and is the number of lines that are drawn horizontally per second. The higher the refresh rate the more resolution the monitor can display.

The vertical scan rate is expressed in Hertz (Hz) and measures the number of times the Screen is re-drawn in its entirety for every second. At lower rates the eye tends to notice a flicker so a higher number is preferred.

Look for a monitor that can handle 75hz or better.

Monitors come in Interlaced and non-Interlaced types. The interlaced monitor fills the screen by first painting the odd lines and on a second pass painting the even lines. The Non-interlaced monitors fill the screen with one pass.

The two most popular standards in use today are the Swedish MPR-II and TCO '92 standards and govern the radiation emissions of monitors. The TCO '92 standards is the stricter of the two.

Plug and Play (PnP) allows the computer to automatically detect the monitor and in many cases allows the user to change resolutions on-the-fly (without rebooting).

The type of masks used on the CRT are: Aperture-Grille, Slot-Mask (shadow mask), and Dot-Trio shadow mask

Monitors can also come with picture tubes that are shorter than the average depth. This makes them stand out less when placed up against a wall.

Better monitors also provide anti-reflective surfaces to cut down glare.

Power Management can also be provided making the monitor compatible with operating systems like windows which can put it in a mode which uses less power, put them in a stand-by mode or shut them off completely.

And for universal compatibility, monitors can come equipped with power supplies capable of switching between different voltages.

Shadow Mask and Aperture Grille description -

Shadow Mask has a plate behind the glass between the phosphor and the electron beams. Holes in the plate are precisely aligned so that only the appropriate beam is allowed to hit the red, green or blue phosphor, a shadow mask absorbs electron energy, which is converted to heat. The distance between two holes in the shadow mask masking two adjacent dots of the same color is called dot pitch.

Aperture Grille: fine tightly stretched wires align the electron beams with the appropriate phosphors. Since an aperture grille allows more electrons to pass through, the electron beams need not be as powerful as those in a shadow mask CRT. The measurement of the horizontal spacing between wires in the Aperture Grille is analogous to dot-pitch on a shadow mask. Since there is no break in the Aperture Grille or phosphor stripes vertically, the vertical dot pitch is zero.

Dot-Pitch

DotPitch.gif (1571 bytes)

The diagonal distance from the center of one phosphor dot to the center of the next closest dot of the same color ( not the horizontal or vertical distance).

Stripe Pitch

Stripe_Pitch1.gif (2030 bytes)

Stripe pitch is the distance between same colors horizontally.

A 0.25mm stripe pitch is equivalent to a 0.27mm dot pitch.

 

Monitor Standards

 

 


 

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